Summary of the invention
The objective of the invention is to overcome the defective that exists in the prior art, provide a kind of metal base is had good adhesion, paint film has excellent flexibility, and after the foaming, adhesive aggregation can reach coiled material polyurethane primer more than 90% at the whipping agent on the paint film.
Technical scheme of the present invention is as follows:
The polyurethane primer that coiled material of the present invention is used is to be formed by vibrin 1, vibrin 2, linking agent, pigment, epoxy phosphate compound, curing catalysts and solvent uniform mixing, and each component and weight % content are:
Component weight %
Vibrin 1 30-50
Vibrin 2 0-20
Linking agent 6-8
Pigment 20-30
Epoxy phosphate compound 1-5
Curing catalysts 0.2-1
Solvent 12-20
Described vibrin 1 be linear vibrin (referring to another application for a patent for invention of patent application of the present invention application in same day, denomination of invention is: a kind of polyester resin for priming lacquer of coiled material and preparation method thereof) molecular weight is 6000-10000, Tg is 30-40 ℃, and viscosity is 20-45 second.
Vibrin 1 is polymerized under the effect of catalyzer by the mixture of polyvalent alcohol, the mixture of polyprotonic acid, then with solvent to rare, each component and weight % content are:
Component weight %
Polyol blends 25-35
Polyprotonic acid mixture 15-20
Catalyzer 0.2-0.3
Solvent 44.7-59.8
The component of described polyol blends and weight % content are
Component weight %
Neopentyl glycol 50-75
Methyl propanediol 0-25
Tertiary carbonic acid glycidyl ester 0-25
The component of described polyprotonic acid mixture and weight % content are
Component weight %
Hexanodioic acid 10-20
M-phthalic acid 40-60
Terephthalic acid 10-20
Phthalic anhydride 0-15
Trimellitic acid 1,2-anhydride 0-5
Described catalyzer is an organotin catalysts, is selected from dibutyl tin laurate, dimethyl oxalic acid tin or dibutyl tin acetate etc.
The component of described solvent and weight % content are
Component weight %
Dimethylbenzene 0-5
Heavy aromatic solvent (C9-C10) 50-70
1-Methoxy-2-propyl acetate 10-25
Butyl glycol ether 0-10
Diester 0-15
(described diester is made up of with weight ratio dimethyl succinate, Methyl glutarate and dimethyl adipate at 1: 1: 1)
The preparation method of vibrin 1 is as follows: polyprotonic acid mixture, polyol blends are added reactor, slowly be heated to 150-200 ℃, treat to add catalysts after the fusion, continue to be heated to 230-250 ℃, reaction times was controlled at 5-10 hour, reach acid number until reaction and be less than or equal to 2mgKOH/g, viscosity 20-45 second, then with solvent to rare to solids content 40-55%.
The technical indicator and the measured result of vibrin 1 are as follows:
Project | Index | Measured result |
Quality solids content % | ??40-55 | ??40-55 |
Viscosity second | ??20-45 | ??30-36 |
Acid number mgKOH/g | ??≤2 | ??1.6-2 |
Molecular weight | ??6000-10000 | ??8000-10000 |
Second-order transition temperature ℃ | ??30-40 | ??35-37 |
Hydroxyl value mgKOH/g | ??30-40 | ??32-40 |
Described vibrin 2 is Uralac SH974 resins of being produced by DSM N. V., and molecular weight is 15000, and Tg is 47 ℃, and viscosity is 27 seconds.
Described linking agent comprises masked isocyanate and aminoresin.Masked isocyanate is to be selected from hexamethylene diisocyanate, tolylene diisocyanate and hexanodioic acid vulcabond; Aminoresin is to be selected from highly methyl etherified melamine resin, methyl etherified high imino-melamine resin or part methyl etherify melamine resin.The ratio of masked isocyanate and aminoresin is 6-8: 1.
Described pigment is titanium dioxide powder and corrosion-inhibiting pigment, and titanium dioxide powder is a rutile-type, and corrosion-inhibiting pigment is the mixture that is selected from zinc-chrome yellow, strontium chromate or the yellow barium chromate one or more.The ratio of titanium dioxide powder and corrosion-inhibiting pigment is 1.2-1.6: 1.
Described epoxy phosphate compound molecular weight is 300-5000, can promote the sticking power of priming paint and metal substrate.
Described curing catalysts is organotin or the compound that contains amine, organotin catalysts is to be selected from dibutyl tin laurate, dimethyl oxalic acid tin or dibutyl tin acetate, and the compound that contains amine is to be selected from triethylamine, diazabicylo [2.2.2] octane or an azabicyclic [2.2.2] octane.
Described solvent is the mixture that is selected from 1-Methoxy-2-propyl acetate, N-BUTYL ACETATE, butyl glycol ether, diester (dimethyl succinate, Methyl glutarate and dimethyl adipate are formed with weight ratio at 1: 1: 1) or the dimethylbenzene two or more.
The preparation method of the polyurethane primer that coiled material of the present invention is used:
By said ratio that vibrin 1, titanium dioxide powder, corrosion-inhibiting pigment and stirring solvent is even, be ground to fineness then and become mill base below 15, standby.The vibrin 1 of remainder and vibrin 2, linking agent, curing catalysts, epoxy phosphate compound and remaining solvent is even, under agitation ground mill base is slowly added in the container of above-mentioned premix honest material again, obtain primer solution.
Coiled material of the present invention is as follows with the technical indicator and the The performance test results of polyurethane primer:
Project | Index | Measured result |
Viscosity S | ??30±5 | ??30-34 |
Quality solids content % | ??≥54 | ??55-56 |
The highest metal sheet temperature (PMT) ℃ | ??232-241 | ??232-241 |
Set time S | ??20-25 | ??21-23 |
Film thickness um | ??5-8 | ??6 |
Crooked T | ??≤2 | ??1 |
Pencil hardness | ??F-2H | ??F |
Shock strength J | ??9.04 | ??9.04 |
(MEK) is inferior for solvent resistance | ??≥3 | ??20 |
Coiled material of the present invention is fast with the polyurethane primer curing speed, can 23 seconds PMT (the highest metal sheet temperature) reach 241 ℃, MEK can reach 20 times, metal substrate had excellent sticking power, paint film has good flexible, and T is curved can to reach 0-2T, is fit to building, household electrical appliances etc. and requires T to bend higher occasion.It can be used for two and be coated with two bakings, can be used for two again and is coated with a baking, has well expandablely, and after the foaming, adhesive aggregation can reach more than 90% at the whipping agent on the paint film.
The present invention adopts coil painting, and the evaporable solvent can be handled by the incendiary mode in the process of baking, can save energy, eliminate pollution to environment, and belong to green production, meet national industrial policies, have good social benefit and economic benefit.
Embodiment
The embodiment 1 coiled material of the present invention preparation method of polyurethane primer
At first prepare vibrin 1: with 187.5 kilograms neopentyl glycol, 62.5 the methyl propanediol of kilogram, 15 kilograms hexanodioic acid, 90 kilograms m-phthalic acid, 30 kilograms terephthalic acid, 15 kilograms of phthalic anhydrides add reactor, slowly are heated to 170 ℃, treat to add 2 kilograms of dibutyltin dilaurate catalysts after the fusion, continue to be heated to 240 ℃, the reaction times was controlled at 10 hours, and final reaction reaches acid number 2mgKOH/g, viscosity 30 seconds, 32 kilograms of aquifer yields are used 386.4 kilopond aromatic solvents (C9-C10) then, 138 kilograms of 1-Methoxy-2-propyl acetates and 27.6 kg ethylene glycol butyl ether to rare to solids content 40%, promptly get vibrin 1, standby.Record molecular weight 8000, viscosity 30 seconds, Tg35 ℃, hydroxyl value 34mg KOH/g, acid number 2mg KOH/g.
The preparation of priming paint takes by weighing 200 gram vibrin, 1,140 gram rutile titanium dioxide powder, 90 gram zinc chrome blooms, 10 gram yellow barium chromate powder, 45 gram 1-Methoxy-2-propyl acetates and 30 gram butyl glycol ethers stir, be ground to fineness then and become mill base below 15, standby.265 gram vibrin 1 with remainder, 75 gram hexamethylene diisocyanates, the methyl etherified high imino-melamine resin of 11 grams, 4 gram dibutyl tin laurates, 20 gram epoxy phosphate compounds (molecular weight 3000) and 66 gram 1-Methoxy-2-propyl acetates and 44 gram butyl glycol ethers mix, under agitation ground mill base is slowly added in the container of above-mentioned premix honest material, promptly get primer solution.
The performance of priming paint test of the present invention and the performance of correlated external prior art are as follows:
Project | Primer performance test of the present invention | External prior art
* |
Viscosity S | ??34 | ??25-30 |
Quality solids content % | ??55 | ??52-57 |
The highest metal sheet temperature (PMT) ℃ | ??232 | ??232-254 |
Set time S | ??21 | ??20-25 |
Film thickness um | ??6 | ??5-8 |
Crooked T | ??1 | ??≤3 |
Pencil hardness | ??F | ??≥4B |
Shock strength J | ??9.04 | ??9.04 |
(MEK) is inferior for solvent resistance | ??20 | ??≥3 |
*The performance data of correlated external prior art is the coating data of selecting from relevant.
The embodiment 2 coiled materials of the present invention preparation method of polyurethane primer
Take by weighing 200 gram vibrin, 1,120 gram rutile titanium dioxide powder, 90 gram zinc chrome blooms, 10 gram strontium chromate powder, 45 gram N-BUTYL ACETATEs and 30 gram diesters stir, and are ground to fineness then and become mill base below 15, and are standby.197 gram polyester gram polyester 1 with remainder, 100 gram pet copolyesters 2 (are the Uralac SH974 resins of being produced by DSM N. V., molecular weight is 15000, Tg is 47 ℃, viscosity is 27 seconds), the 65 diacid vulcabond of restraining oneself, the highly methyl etherified melamine resin of 10 grams, 3 gram triethylamines, 20 gram epoxy phosphate compounds (molecular weight 500) and 66 gram N-BUTYL ACETATEs and 44 gram diesters mix, under agitation ground mill base is slowly added in the container of above-mentioned premix honest material, promptly get primer solution.
Performance test is as follows:
Project | Performance test |
Viscosity S | ??30 |
Quality solids content % | ??56 |
The highest metal sheet temperature (PMT) ℃ | ??241 |
Set time S | ??23 |
Film thickness um | ??6 |
Crooked T | ??1 |
Pencil hardness | ??F |
Shock strength J | ??9.04 |
(MEK) is inferior for solvent resistance | ??20 |